Abstract
Purpose
Both rotational acetabular osteotomy (RAO) and eccentric rotational acetabular osteotomy (ERAO) are effective procedures for young patients with developmental dysplasia of the hip. However, no comparative study of biomechanical changes has been reported following these two procedures. We therefore explored the stress changes on femoral head after RAO and ERAO under different load conditions.
Materials and methods
Twelve female cadaveric hips without deformity were divided into RAO group and ERAO group. Stress value on femoral head was measured preoperatively and postoperatively after the vertical force was loaded on the cadaveric spine from 0 to 500 N. Stress change value was then calculated base on the measurements.
Results
In the RAO group, preoperative stress increased when loading on spine became larger, but postoperative stress changed its increasing trend into decreasing when the load was greater than 200 N (turning point). Same phenomenon was found in the ERAO group (turning point was 300 N). However, the difference between preoperative and postoperative stress was not statistically significant in both RAO and ERAO groups. Stress change value from each procedure showed similar trends. With the load growth, stress change increased firstly and then decreased, but the difference between RAO and ERAO was not statistically significant.
Conclusions
Both RAO and ERAO could correct the abnormal biomechanical effect of dysplastic hip; moreover, they may have similar biomechanical effects on femoral head, obtaining the same clinical outcomes. Non-biomechanical factors (surgical trauma, technical complexity, etc.) also play important roles in procedure selection.
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Acknowledgments
We appreciate helpful comments and suggestions from Yukiharu Hasegawa, MD, PhD (Department of Orthopaedics, Nagoya University School of Medicine).This study was supported by Guangdong Provincial Science and Technology Project Grant (2010B031100026), the International Science and Technology Cooperation of Science and Technology of Guangdong Province (2010B050300009) and the High Technological Industrialization Project of Guangdong Province (2011B010500012), China.
Conflict of interest
We declare that no benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript named “a comparison of biomechanical changes on femoral head following rotational acetabular osteotomy and eccentric rotational acetabular osteotomy in normal cadaveric hip.”
Ethics standard
The study protocol was approved by the medical ethics committee of First Affiliated Hospital of Sun Yat-sen University (date of issue: 2012.1.12, registration number: 41), Guangzhou, Guangdong, China.
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Ziqing Li and Shiming Yu are contributed equally to this paper.
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Li, Z., Yu, S., Hou, C. et al. A comparison of biomechanical changes on femoral head following rotational acetabular osteotomy and eccentric rotational acetabular osteotomy in normal cadaveric hip. Eur J Orthop Surg Traumatol 24, 179–186 (2014). https://doi.org/10.1007/s00590-012-1163-0
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DOI: https://doi.org/10.1007/s00590-012-1163-0